Question

9i(3i)
-27i
27
27i
-27

Explanation:

Step1: Multiply coefficients

$9\times3 = 27$

Step2: Multiply imaginary units

$i\times i=i^{2}$
Since $i^{2}=- 1$, then $27\times i^{2}=27\times(-1)=-27$

Answer:

$-27$